Very Strange Behaviour of Rest Api - Cannot Follow Via Rest Api But Can Follow Via Twitter's Own Interface?


I get “Forbidden-You are unable to follow more people…” error when trying to follow via Rest Api. But with the same account i can follow people via Twitter’s own GUI. Are there different limitations for api and Twitter gui? How can it be possible, any idea?
(Total follow request sent by rest api is over 100.000 in 2013 nowadays. Can it be related with that?)